EngineMedium
1.5T carbon build-up / oil consumption.
- Typically appears
- 60,000+ miles
- What to inspect
- Check oil level and watch for rough idle.
2018–2023 GMC Terrain — common problems & known faults
The 2nd-gen Terrain uses small turbo engines; carbon build-up and the 9-speed are the main checks.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Known faults to check
TransmissionMedium
9-speed shudder and shift-to-park glitch.
- Typically appears
- Any
- What to inspect
- Feel for shudder and confirm clean park engagement.
HVACMedium
AC condenser faults.
- Typically appears
- 70,000+ miles
- What to inspect
- Confirm cold AC output.
ElectricalLow
Stabilitrak / infotainment glitches.
- Typically appears
- Age-related
- What to inspect
- Watch for warnings and test the screen.
Inspecting a GMC Terrain?
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Generate a free checklistFrequently asked questions
Is the Terrain reliable?
Average — turbo carbon build-up and 9-speed behaviour are the usual concerns.
Is the 1.5T strong enough?
It's adequate for daily driving; the 2.0T is livelier if you tow or load it.
Does the Terrain have the shift-to-park fault?
Some do; confirm it engages park without a persistent warning.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.